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package com.oracle.truffle.llvm.runtime.nodes.vars;

import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
import com.oracle.truffle.api.dsl.NodeChild;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.ExplodeLoop;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMStoreNode;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMExpressionNode;
import com.oracle.truffle.llvm.runtime.pointer.LLVMPointer;

@NodeChild(type = LLVMExpressionNode.class)
public abstract class StructLiteralNode extends LLVMExpressionNode {

    @CompilationFinal(dimensions = 1) private final long[] offsets;
    @Children private final LLVMStoreNode[] elementWriteNodes;
    @Children private final LLVMExpressionNode[] values;

    public StructLiteralNode(long[] offsets, LLVMStoreNode[] elementWriteNodes, LLVMExpressionNode[] values) {
        assert offsets.length == elementWriteNodes.length && elementWriteNodes.length == values.length;
        this.offsets = offsets;
        this.elementWriteNodes = elementWriteNodes;
        this.values = values;
    }

    @ExplodeLoop
    @Specialization
    protected LLVMPointer doLLVMPointer(VirtualFrame frame, LLVMPointer address) {
        for (int i = 0; i < offsets.length; i++) {
            LLVMPointer currentAddr = address.increment(offsets[i]);
            Object value = values[i] == null ? null : values[i].executeGeneric(frame);
            elementWriteNodes[i].executeWithTarget(frame, currentAddr, value);
        }
        return address;
    }
}
